6.4 Solving Compound Inequalities 1. solve compound inequalities. graph the solution sets of compound inequalities. Indicators: NS4, PA9, PA7, PA8 Designed by Skip Tyler, Varina High School Edited by Eddie Judd, Crestwood Middle School

What is the difference between and and or? AND means intersection -what do the two items have in common? OR means union -if it is in one item, it is in the solution A B

● ● ● 1) Graph x < 4 and x ≥ 2 a) Graph x < 4 o o b) Graph x ≥ 2 3 4 2 o 3 4 2 o b) Graph x ≥ 2 3 4 2 ● ● c) Combine the graphs d) Where do they intersect? ● 3 4 2 o

● ● ● 2) Graph x < 2 or x ≥ 4 a) Graph x < 2 o o b) Graph x ≥ 4 3 4 2 o o 3 4 2 b) Graph x ≥ 4 3 4 2 ● 3 4 2 ● c) Combine the graphs 3 4 2 ● o

3) Which inequalities describe the following graph? -2 -1 -3 o y > -3 or y < -1 y > -3 and y < -1 y ≤ -3 or y ≥ -1 y ≥ -3 and y ≤ -1 Answer Now

4) Graph the compound inequality 6 < m < 8 When written this way, it is the same thing as 6 < m AND m < 8 It can be rewritten as m > 6 and m < 8 and graphed as previously shown, however, it is easier to graph everything between 6 and 8! 7 8 6 o

5) Which is equivalent to -3 < y < 5? y > -3 or y < 5 y > -3 and y < 5 y < -3 or y > 5 y < -3 and y > 5 Answer Now

6) Which is equivalent to x > -5 and x ≤ 1? Answer Now

7) 2x < -6 and 3x ≥ 12 o o o o Solve each inequality for x Graph each inequality Combine the graphs Where do they intersect? They do not! x cannot be greater than or equal to 4 and less than -3 No Solution!! -3 -6 o -3 -6 o 4 7 1 o 4 7 1 o

8) Graph 3 < 2m + 1 < 9 Remember, when written like this, it is an AND problem! 3 < 2m + 1 AND 2m + 1 < 9 Solve each inequality. Graph the intersection of 1 < m and m < 4. - 5 5

9) Graph x < 2 or x ≥ 4 5 -

The whole line is shaded!! 10) Graph x ≥ -1 or x ≤ 3 The whole line is shaded!!

Assignment Pg. 318 Problems 9-41 odds